my neighbour tried it for 4 months... i guess he was around 240-250 when I was out of town for university....... and when I first saw him when i was back in town, the first thing i said wasnt "hey man" but rather "holey sh!t man, you have lost some serious weight!!!"
he looked SO slim compared to the image i had in my mind, he lost around 35 pounds i think.
but you have to work for it, because he said he wanted to try it again for another 4 months but he wasnt sure if he could do it again... go figure
but if you do as they tell you to do, it does work